Opendssdirect.py

- Add `clean_code` option for `class_to_dataframe`
- Code quality, autoformat and testing improvements

Fix version string

- Full package rewrite (thanks to PMeira) using [`dss_python`](https://github.com/PMeira/dss_python/)
- Fix memory leaks
- Add Y Matrix functions
- Fix issues with ControlQueues
- Support .sng and .dbl file formats
- Remove 'Empty var_arr found' warning
- Change interface behaviour to more explicit read only or read write functions